Research On Influence Of Differential Settlement On Crts ? Slab Track System And Longitudinal Anchor Structure

The development of transportation is a history of continuous speed increasement.And the prosperity of high-speed railways has injected new vitality and opportunities into the road transportation.Train load was transferred into the subgrade by structural components of ballastless track.The settlement of the side spine zone of the subgrade caused by the long-term load effect will affect the working life of component,stability of the line and the safety of driving.Therefore,When there is differential settlement of the side spine zone of the subgrade,the static analysis of ballastless track components should be conducted to research the influence rules of differential settlement on the track's structure according to its characteristic,which is a theoretical basis for its design and construction.The main content and results of this thesis are as follows:(1)Under the background of the ballastless track's development at home and abroad and on the basis of current research on the backstage anchoring structure,slab ballastless track of the side spine zone,backstage anchoring structure and the causes,types and researching methods of settlement of subgrade at home and abroad are analyzed and summarized.(2)With CRTS? slab ballastless track system and anchoring structure in Xuhu Passenger dedicated line as the research object,based on the Winkler's coupling beam theory for elastic foundation,by the application of nonlinear finite element method,finite element model of CRTS? slab ballastless track-longitudinal anchoring structure-subgrade is established;the static characteristics of ballastless track system and anchoring structure caused by differential settlement of the subgrade in the side spine zone are researched;the law on the deformation and stress of ballastless track system and anchoring structure components influenced by different settlement and track parameters is studied.(3)The study shows that: under the differential settlement of the side spine zone of the subgrade,the ballastless track components undergo follow-up settlementdeformation by the effects from different loads.The deformation curve is similar to the subgrade settlement curve,which is finally reflected in the unevenness of the track surface and the track structure is significantly affected by the force.The study shows that settlement amplitude and settlement wave length have a relatively greater effect on the mechanical properties of CRTS ? slab ballastless track and anchoring structure.The settlement amplitude of the side spine zone of the subgrade will lead to the voiding phenomenon of the ballastless track structure layer.The settlement wavelength also has an impact on the track structure,which may cause line irregularities.Especially,at the wavelength of 20 m?25 m,the deformation and press will be the most affected.Besides,under the circumstance of subgrade settlement in certain side spine zone,settlement deformation may be restrained to some point by thickening the size parameter of ballastless track structure and anchoring structure components;The elastic modulus of CA mortar cushion has little effect on the deformation and stress of ballastless track,while the reduction of the elastic modulus of the concrete structure has a great influence on the deformation and stress of the ballastless track structure.